Any rifle brass can fail in several ways, depending on it's age, and how it was loaded. If the brass just gets brittle from repeated loadings, then a neck split is usually how it fails. If there's a flaw in the brass, it can crack or develop a hole wherever that flaw is, but in my experience it's usually somewhere in the wall of the case. If the shoulder has been set back too far, then brass flow will cause the case head to separate just above the web, referred to as "insipient case head separation". You can usually see this about to occur as indicated by a line just above the web, or you can use a wire bent into a 90 degree angle and probe the inside of the case at the web and you'll feel it catch where the brass has started to thin.
The other failure is the primer pockets become enlarged and the primer is either just barely held in place, or falls out. You can feel that when seating the primers.
Fred